Two lanes of westbound Interstate 80 are blocked after a tree fell onto the highway as strong winds and heavy rain moved through the area on Wednesday.

A powerful cold front barreling in from the west is set to batter San Francisco and the Bay Area with heavy rain and strong winds over the next few hours. A severe thunderstorm warning was issued for San Francisco as up to an inch of rain may fall in just a few hours — especially in the North Bay hills,